cc: Fix PictureLayerImpl::SanityCheck condition

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 94c3d201639d0dd90a29545ba18ca067f43edd8a..b7341b784d023ed85bfb874fbb4ccdc39e69d664 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -676,7 +676,8 @@ void PictureLayerImpl::SyncTiling(
     return;
   tilings_->AddTiling(tiling->contents_scale());
 
-  if (!layer_tree_impl()->needs_update_draw_properties()) {
+  if (!layer_tree_impl()->needs_update_draw_properties() &&
+      should_update_tile_priorities_) {
     // When the tree is up to date, the set of tilings must either be empty or

[enne (OOO), 2014/04/28 23:45:28]

Can you just move this comment and check into the block below that has the same
conditional?

[boliu, 2014/04/28 23:50:39]

Done.

     // contain at least one high resolution tiling.  (If it is up to date,
     // then it would be invalid to sync a tiling if it is the first tiling